The art of losing isn’t hard to master (1.1, 2.6, 4.12)
This line loses its truthfulness slowly as the poem proceeds, and we see that the art of losing is, in fact, quite difficult, if not impossible, to master.
– Even losing you (the joking voice, a gesture I love) I shan’t have lied. (6.16-17)
The poet attempts to assert the truth of her claim here, saying that her ability to get over the loss of the beloved person addressed here proves that she’s mastered the art of losing.
The art of losing’s not too hard to master (6.18)
Finally, the poet concedes that she’s been somewhat deceptive – the art of losing, she admits, is hard to master, albeit not too hard.